Automatic tensioner for belts or chains



FIG. 1 is a front elevational view of an automatic tensioner for belts or chains, showing my new design;

FIG. 2 is a side elevational thereof from the right of FIG. 1;

FIG. 3 is a rear elevational thereof;

FIG. 4 is a side elevational view thereof from the left of FIG. 1;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front and side perspective view thereof;

FIG. 8 is a rear and side perspective view thereof;

FIGS. 9-16 are views similar to FIGS. 1-8 respectively, but showing a second embodiment thereof; and,

FIGS. 17-24 are views similar to FIGS. 1-8, respectively, but showing a third embodiment thereof. 

The ornamental design for an automatic tensioner for belts or chains, as shown and described. 